Peri-urban Areas Research Articles

The Agrihood Design: Valuation of Ecosystem Services for NbS Visions in Peri-urban Housing Estate Development, Bangkok, Thailand

Nature-based Solution (NbS) designs increasingly are being implemented to reduce environmental impacts of urban development and enhance community resiliency to disruptions ranging from floods to climate change to Covid-19. But, the question remains, how do we assess the ecosystem service benefits provided by competing NbS designs in order to optimize such benefits? As such, the objective of this study was to develop and trial an assessment approach for the valuation of ecosystem services in a peri-urban area of Bangkok, Thailand. In our evaluations we considered the ecosystem service benefits of: i) water yield; ii) sediment yield; iii) nutrient yield; iv) carbon sequestration; v) urban heat island mitigation; vi) crop production; vii) habitat quality; and viii) aesthetics. Our ecosystem services valuation approach was tested using three case studies in peri-urban Bangkok, Khlong Luang, Pathum Thani: i) an existing new single detached housing development in the area; ii) an area in its currently undeveloped, open and scrub forest state; and iii) the same area as (ii), but theoretically developed using an Agrihood design concept. The valuation approach included a combination of mathematical modeling for the water, sediment, and nutrient yield ecosystem services and an empirical, data-driven approach for urban cooling, carbon sequestering, crop production, habitat quality, and aesthetics. While the existing housing development design was meant to be relatively green and nature-oriented, the Agrihood design outperformed it in every ecosystem service category, including habitat quality and aesthetics. The Agrihood design also had lower sediment and nutrient yields and mean concentrations as compared to current (natural) conditions at the site, which is attributed to the inclusion of constructed wetlands in the design for the main drainage canal. This work represents a good preliminary step in establishing a local scale ecosystem services valuation framework for urban areas in a tropical climate, but additional refinements to the indicator determinations are needed.

Detection of Rickettsia amblyommatis and Rickettsia bellii in ticks collected from pet dogs in peri-urban and rural areas in Yucatan, Mexico.

Rickettsia species are bacteria that may cause multiple diseases in animals and humans, via transmission through multiple arthropod vectors. Routine surveillance of Rickettsia spp. within vectors is critical to determine their presence and risk to mammalian hosts within human populations. Therefore, to better characterize the circulating Rickettsia species in an understudied region we targeted pet dogs to survey. Ticks were collected from pet dogs in three populations of the Yucatan where we tested for the presence of Rickettsia spp. by PCR in metagenomic DNA. In these ticks removed from pet dogs we detected Rickettsia amblyommatis and Rickettsia bellii in Amblyomma auriculatum, Amblyomma ovale and Amblyomma mixtum ticks obtained in a rural community in the Mexican state of Yucatan. This is the first report detecting both species for this state in Mexico, underpinning the importance of more routine surveillance.

Cytokine Gene Expression Profiles during HIV and Helminth Coinfection in Underprivileged Peri-Urban South African Adults.

Intestinal helminth parasites are potent stimulators of T helper type 2 (Th2) and regulatory Th3 anti-inflammatory immune responses, while human immunodeficiency virus (HIV) infections are activators of predominantly T helper type 1(Th1) pro-inflammatory responses. Studies investigating the immune profiles of individuals coinfected with helminths and HIV are scarce. Although it is well known that helminths cause a type 2 immune response during the chronic stage of infection that is characterised by Th2 cell differentiation, eosinophil recruitment, and alternative macrophage activation, the immune mechanisms that regulate tissue damage at the time of parasite invasion are poorly understood. The aim of the study was to determine the cytokine gene expression profiles during HIV and helminth coinfection in underprivileged South African adults living in a peri-urban area with poor sanitary conditions and a lack of clean water supply. Study participants (n = 164) were subdivided into uninfected controls, HIV-infected, helminth-infected, and HIV and helminth-coinfected groups. The Kato-Katz and Mini Parasep techniques and Ascaris lumbricoides-specific Immunoglobulin E (IgE) and Immunoglobulin G4 (IgG4) levels were used to detect helminth infections. Participants' HIV status was determined using two HIV1/2 antibody test kits. RNA was isolated from white blood cells for cytokine (Th1-, Th2-, and Th17-related) and transcription factor gene expression profiling using real-time PCR. Multivariate regression data were adjusted for age, gender, BMI, antiretroviral treatment (ART), and nutritional supplement intake. The HIV and helminth-coinfected group had significantly higher tumour necrosis factor alpha (TNF-α) (adjusted β = 0.53, p = 0.036), interleukin 2 (IL-2) (adjusted β = 6.48, p = 0.008), and interleukin 17 (IL-17) (adjusted β = 1.16, p = 0.001) levels and lower GATA binding protein 3 (GATA3) levels (adjusted β = -0.77, p = 0.018) compared to the uninfected controls. No statistical significance was noted for Th2-related cytokines. The coinfected group had higher proinflammatory Th1- and Th17-related cytokine gene expression profiles compared to the uninfected controls. The findings suggest that pro-inflammatory responses are elevated during coinfection, which supports the hypothesis that helminths have a deleterious effect on HIV immune responses.

Exploring the magnitude and drivers of the double burden of malnutrition at maternal and dyad levels in peri-urban Peru: A cross-sectional study of low-income mothers, infants and young children.

Multiple forms of malnutrition coexist in Peru, especially in peri-urban areas and poor households. We investigated the magnitude of, and the contribution of, dietary and socio-demographic factors to the double burden of malnutrition (DBM) at maternal (i.e., maternal overweight/obesity with anaemia) and dyad (i.e., maternal overweight/obesity with child anaemia) levels. A cross-sectional survey was conducted among low-income mother-child (6-23 months) dyads (n = 244) from peri-urban communities in Peru. Dietary clusters and the minimum dietary diversity score (MDD) were generated for mothers and infants, respectively. A composite indicator using the maternal dietary clusters and the MDD was created to relate to dyad level DBM. Two dietary clusters were found: (i) the 'high variety (i.e., animal-source foods, fruit and vegetables), high sugary foods/beverages' (cluster 1) and (ii) the 'high potato, low fruit and vegetables, low red meat' (cluster 2). DBM prevalence among mothers and dyads was 19.9% and 36.3%, respectively. Logistic regression analyses revealed that the only socio-demographic factor positively associated with maternal DBM was maternal age (aOR/5 years: 1.35 [1.07, 1.71]). Mothers belonging to diet cluster 1 were less likely to experience the DBM (aOR = 0.52 [0.26, 1.03]), although CIs straddled the null. Socio-demographic factors positively associated with dyad level DBM included maternal age (aOR/5 years: 1.41 [1.15, 1.73]), and having ≥ two children under 5 years (aOR = 2.44 [1.23, 4.84]). Diet was not associated with dyad-level DBM. Double-duty actions that tackle the DBM are needed given that one-third of dyads and a fifth of mothers had concurrent overweight/obesity and anaemia.

Land tenure, food security, gender and urbanization in Northern Ghana

Links between land tenure and food and nutritional insecurity are receiving increased attention. Nevertheless, urban and periurban dwellers face challenges in accessing land to produce food for subsistence and sale. An ethnographic study and food and nutrition insecurity survey were conducted between October 2013 and November 2014 in Tamale, Northern Region of Ghana, to explore the dynamic and recursive links between land access, food access and the ability to maintain resources to meet long-term needs. Results showed that infrastructural development and agriculture compete for land. The shortage of land for agricultural purposes was pronounced in urban areas (20%) than in periurban areas (1.3%) and rural areas (0%). Food insecure households were more likely to name a lack of land than anything else as the primary reason for their inability to grow crops (Fisher’s exact probability = 0.040). Urban and periurban dwellers cope with the constraints posed in the communal tenure system by using strategies such as urban–periurban-rural migrant farming and buffer zone cultivation. The role of women in providing nutritious soups is especially important, and they use various mechanisms to circumvent their lack of access to land and provide food for the household. Political, economic and cultural elements thus interact to constitute the link between land and food.

Untangling Biocultural and Socioeconomical Drivers of African Plum Tree (Dacryodes edulis) Local Nomenclature Along a Rural-Urban Gradient in Central Cameroon

In Cameroon, the African plum tree (Dacryodes edulis [G. Don] H. J. Lam) is widely cultivated for its fruits, which contribute significantly to household food security and economy. In order to analyze the links between the social and ecological systems that result in the remarkable fruit diversity, we focused on how the important varietal diversity of African plums was perceived and named by tree owners. We conducted semi‑structured interviews in Center-Cameroon with 142 people belonging to the Beti ethnic group, in urban (Yaoundé), peri-urban and rural areas, and analyzed the data qualitatively and quantitatively. Along this urbanization gradient linking production to consumption regions, 158 different translated names were recorded. Most names (80%) were cited once, but some names based on fruit size and taste were common across the gradient. Although the highest total number of names was recorded in the rural site, many different names were also found along the urban–rural gradient. We did not detect difference in the number of named African plums between respondents with different characteristics. The local classification of African plums among the Beti was structured predominantly according to morphological and organoleptic criteria, but also to symbolic and practical criteria. African plums’ names were based on people’s fruit preferences, that favor large, oily, and blue to black fruits, and disregard pink-colored watery plums. This study is an entry point to explore the rising trade and thus ongoing domestication of the African plum tree from an often neglected perspective, that of local nomenclature.

Comparative analysis of local adaptation processes in the future across peri-urban India to support transformations to sustainability

Peri-urban transformations in emerging economies like India demand scientific attention given their impact on global environmental change processes. Some studies examine past or ongoing peri-urban adaptation processes, but insight into future adaptation needs and aspirations of peri-urban communities is lacking. Also, it is unknown how the high degree of informality that characterizes peri-urban areas, interacts with formal institutions to shape or enable more sustainable adaptation pathways. This study addresses these scientific gaps, using an existing typology of adaptation processes to investigate plausible future adaptation pathways in three peri-urban villages in India, near Pune, Hyderabad, and Kolkata cities. On-site field research followed by a Delphi-study were used to develop normative adaptation pathways for livelihood and household water use with local actors. The pathways represent development trajectories and adaptation strategies over the next 15 years in the livelihood and household water sectors. Pathways data was thereafter analyzed and compared in terms of drivers of vulnerability and opportunity, adaptation processes, and formal and informal institutions. Our ex-ante study identifies general and context specific drivers of vulnerability and opportunity shaping different peri-urban transformations. Results reveal similarities in future drivers, whose impact on peri-urban livelihoods and household water is context dependent. This comparative analysis contributes a deeper understanding of future adaptation needs by highlighting patterns in locally preferred adaptation processes for different drivers and water-use sectors. This normative understanding reveals preferences of local communities who are otherwise marginalized from decision-making arenas. A combination of adaptation processes will be needed to respond to the various drivers, only some of which are achievable through informal institutions. Formal government intervention will be essential for stimulating innovation, intensification, and revitalization forms of adaptation. Institutional adjustments will be key to shaping local agency and future adaptive capacity away from a business-as-usual trajectory.

Why the Car Is Not Always King in Global South Cities: Evidence From Ulaanbaatar

Access to a private car has established itself as a critical control on mobility and access to opportunities for residents living in a diverse range of settings, globally. Across cities of the Global South, the benefits of private car access are often intensified by the absence of viable alternative modes of travel. This article explores the influence of private car access and mobility in relation to residents living in “ger district” areas of Ulaanbaatar, Mongolia’s capital city. These peri-urban areas are informally created when rural migrants set up home on the edge of the city, initially using mobile felt dwellings called “ger” that become augmented or replaced by permanent structures over time. An absence of forward planning as well as unmade roads and hilly topography mean that the ger districts are often poorly served by public transport, while the low density of the built environment also means that informal transport services can be limited in coverage and relatively expensive. This article utilises a database of household questionnaires collected in 2020 to compare mobility patterns and accessibility between car-owning and non-car-owning households in three case study ger districts, capturing seasonal differences between the extreme cold of the wintertime and warmer summer conditions. The findings not only reveal stark mobility and access differences in relation to car ownership but also discrepancies between car ownership and actual car use for important and routine journeys. This indicates that despite a lack of public transport available, many households opt to use what public transport they can. This pattern provides a potentially important basis for future policies that aim to limit car use in order to reduce traffic congestion and broaden access to the city for non-car-owning households by providing more accessible public transport.

Reconversion of Agri-Food Production Systems and Deagrarianization in Spain: The Case of Cantabria

The term deagrarianization refers to the dwindling importance of agrarian activity as the economic and social basis of a rural area. Deagrarianization is reflected in the declining number of people engaged in agricultural production and a reduction in the relative importance of agricultural incomes. In addition to the economic consequences, deagrarianization also erodes the importance of the rural population in territorial organization and management and social functioning in rural areas. However, it is also true that the simultaneous shift towards the service economy in present-day rural economies and societies has not led to the disappearance of the rural space but, instead, given rise to new and multiple forms of rurality. The priority objective of the research on which this paper is based is to gain insight into the rural deagrarianization processes in Spain through the specific case of Cantabria. In order to analyze these dynamics, a series of basic indicators have been used. In order of importance, the main indicators employed were those related to the recent dynamics of agriculture, livestock, and forestry activity and the occupational structure of the population as regards its sectoral distribution, with particular attention being paid to the relative importance of livestock and forestry activities in relation to the direct exploitation of territorial resources. In the past, primary sector activities were very important in Cantabria, but their importance has steadily declined in both absolute and relative terms until reaching the current situation. In 2023, only 4579 people have been employed in agriculture out of a total of 214,574 active people (2.13%). It is very significant that between 2012 and 2021, the total number of employed people increased by 9.08% in Cantabria while the proportion of people employed in agricultural activities decreased by −12.90%. Farming is no longer the rural occupation par excellence; however, it continues to be important in most Cantabrian rural municipalities. The territorial distribution is even more revealing. Southern mountain municipalities can be considered the last stronghold of agricultural activity since, in most cases, more than a quarter of their active population is employed in this sector. These are also the rural areas with the highest levels of depopulation. In contrast, other activity sectors have also gained importance in rural areas, although not in the same way. In general, there is less service economy employment in inland rural municipalities, except in those that are county capitals offering services. Some rural, peri-urban, and coastal areas where tourism is more strongly developed also reach high values.

Evolution of farmland landscape fragmentation and its driving factors in the Beijing-Tianjin-Hebei region

Farmland landscape fragmentation has become one of the main manifestations of global land use changes during the last century. Since the reform and opening-up in China, the Beijing-Tianjin-Hebei region, as the representative region in China, has exhibited a continuous process of farmland landscape fragmentation. Scientifically revealing the spatiotemporal dynamics of farmland landscape fragmentation is of great significance for sustainable land management. Although the characteristics of farmland landscape fragmentation have been widely studied, measuring the dynamics of farmland landscape fragmentation from the perspectives of landforms and urban-rural variations remains poorly understood. This study relies on the comprehensively theoretical models to spatiotemporally identify farmland landscape fragmentation and applies a comprehensive index method that includes ArcGIS, FRAGSTATS landscape pattern analysis and the multiscale geographically weighted regression model to empirically analyse the spatial-temporal characteristics of farmland landscape fragmentation in China from 1980 to 2020. The results indicate that the value of the farmland landscape fragmentation index in the Beijing-Tianjin-Hebei region is characterised by process of ‘slight increase-rapid decrease-continuous increase’. High farmland landscape fragmentation index values were observed in the northern and western Beijing-Tianjin-Hebei regions. Moreover, significant differences in farmland landscape fragmentation were observed under different macro landforms. The farmland landscape fragmentation index in the mountainous regions is much higher than in the plains. Furthermore, as the distance to Beijing's centre increases, the farmland landscape fragmentation index decreases in suburban and peri-urban areas. Finally, the results also reveal the driving factors of farmland landscape fragmentation. The results showed that the natural environment is always the crucial driver of farmland landscape fragmentation. Besides, social activities play an important role in the past, but economic development has a more significant coefficient these days. The findings of this study not only verify that the proposed theoretical framework is valid and provides a reference for future policy measures to protect farmland but also provide a basis for farmland landscape fragmentation from a multiscale perspective by, more precisely, identifying the heterogeneity of drivers.

Invasive Aedes mosquitoes in an urban—peri-urban gradient in northern Spain: evidence of the wide distribution of Aedes japonicus

BackgroundThe expansion of invasive mosquitoes throughout Europe has increased in recent decades. In northern Spain, Aedes albopictus was detected for the first time in 2014, and Aedes japonicus was detected in the three Basque provinces in 2020. This study aimed to evaluate the distribution of these mosquito species and their association with factors related to urbanization.MethodsIn 2021, a total of 568 ovitraps were deployed in 113 sampling sites from 45 municipalities with > 10,000 inhabitants. Oviposition substrate sticks were replaced each fortnight and examined for Aedes eggs from June to November. Aedes eggs were counted, and the eggs from a selection of positive oviposition sticks, encompassing at least one stick from each positive ovitrap, were hatched following their life cycle until the adult stage. When egg hatching was not successful, PCR targeting the COI gene and sequencing of amplicons were carried out.ResultsEggs were detected in 66.4% of the sampling sites and in 32.4% of the ovitraps distributed in the three provinces of the Basque Country. Aedes albopictus and Ae. japonicus were widespread in the studied area, confirming their presence in 23 and 26 municipalities, respectively. Co-occurrence of both species was observed in 11 municipalities. The analysis of the presence of Aedes invasive mosquitoes and the degree of urbanization (urban, suburban, peri-urban) revealed that Ae. albopictus showed a 4.39 times higher probability of being found in suburban areas than in peri-urban areas, whereas Ae. japonicus had a higher probability of being found in peri-urban areas. Moreover, the presence of Ae. albopictus was significantly associated with municipalities with a higher population density (mean = 2983 inh/km2), whereas Ae. japonicus was associated with lower population density (mean = 1590 inh/km2).ConclusionsThe wide distribution of Ae. albopictus and Ae. japonicus observed confirmed the spread and establishment of these species in northern Spain. A new colonization area of Ae. japonicus in Europe was confirmed. Due to the potential impact of Aedes invasive mosquitoes on public health and according to our results, surveillance programs and control plans should be designed considering different urbanization gradients, types of environments, and population density.Graphical

Urban and Peri-Urban Vegetation Monitoring Using Satellite MODIS NDVI Time Series, Singular Spectrum Analysis, and Fisher–Shannon Statistical Method

The purpose of this work was to evaluate the potential of Singular Spectrum Analysis (SSA) and the Fisher–Shannon method to analyse NDVI MODIS time series and to capture and estimate inner vegetation anomalies in forest covers. In particular, the Fisher–Shannon method allows to calculate two quantities, the Fisher Information Measure (FIM) and the Shannon entropy power (SEP), which are used to characterise the complexity of a time series in terms of organisation/disorder. Pilot sites located both in urban (Milano, Torino, and Roma) and peri-urban areas (Appia Park, Castel Porziano, and Castel Volturno) were selected. Among the six sites, Roma, Castel Porziano, and Castel Volturno are affected by the parasite Toumeyella parvicornis. The time series was analysed using the products available in Google Earth Engine. To explore and characterise long-term vegetation dynamics, the time series was analysed using a multistep processing chain based on the (i) normalisation of the satellite time series, (ii) removal of seasonality and any other periodical cycles using SSA, (iii) analysis of the de-trended data using the Fisher–Shannon statistical method, and (iv) validation through comparison with independent data and ancillary information. Our findings point out to a clear discrimination between healthy and unhealthy sites, being the first (Milano, Torino, Appia) characterised by a larger FIM (lower SEP) and the second (Roma, Castel Porziano, Castel Volturno) by a lower FIM (larger SEP). The results of the investigations showed that the use of the SSA and Fisher–Shannon statistical methods coupled with the NDVI time series of the MODIS satellite made it possible to effectively identify and characterise subtle but physically significant signals veiled by seasonality and annual cycles.

Groundwater antibiotics contamination in an alluvial-pluvial fan, North China Plain: Occurrence, sources, and risk assessment

Antibiotics in groundwater have received widespread concern because high levels of them harm aquatic ecosystems and human health. This study aims to investigate the concentration, distribution, ecological and human health risks as well as potential sources of antibiotics in groundwater in the Hutuo River alluvial-pluvial fan, North China Plain. A total of 84 groundwater samples and nine surface water samples were collected, and 35 antibiotics were analyzed using ultra-performance liquid chromatography-tandem mass spectrometry. The results indicated that 12 antibiotics were detected in surface water with the total concentrations ranging from 5.33 ng/L to 64.73 ng/L. Macrolides were the primary category of antibiotics with a detection frequency of 77.8% (mean concentration: 9.14 ng/L). By contrast, in shallow granular aquifers (<150 m), 23 antibiotics were detected and the total concentrations of them ranged from below the method detection limit to 465.26 ng/L (detection frequency: 39.7%). Quinolones were the largest contributor of antibiotics with detection frequency and mean concentration of 32.1% and 12.66 ng/L, respectively. And ciprofloxacin and ofloxacin were the two preponderant individual antibiotics. The mean concentration of groundwater antibiotics in peri-urban areas was approximately 1.7–4.9 times that in other land use types. Livestock manure was the predominant source of antibiotics in groundwater. Erythromycin, sulfametoxydiazine, ofloxacin, and cinoxacin exhibited medium ecological risks to aquatic organisms. All antibiotics posed no risks to human health. The findings of this study provide valuable insights into the occurrence and management of antibiotic contamination in the groundwater in the Hutuo River alluvial-pluvial fan.

The role of the perceived environment for recreational walking among adults in socioeconomically disadvantaged situations: A study using walk-along interviews

BackgroundPersons in socioeconomically disadvantaged situations (PSEDS) are generally less likely to engage in recreational walking (RW) compared to higher socioeconomic groups and are often more dependent on their local environment. Studies on RW have primarily focused on the role of the built environment for the general adult population and the older population in urban areas. The aim of this study is to qualitatively identify the perceived environmental factors affecting RW among PSEDS in peri-urban areas. MethodsIn two peri-urban municipalities in Belgium, walk-along interviews were conducted until data saturation with a purposeful convenience sampling of 38 PSEDS (25-65y/o) to identify local environmental factors affecting RW. A subsample of 22 participants joined a focus group (n = 4) to categorize the identified factors into environmental types (physical, sociocultural, political, and economic) of the Analysis Grid for Environments Linked to Obesity (ANGELO) framework. The interviews were transcribed and analyzed thematically using Maxqda 2022.0. ResultsThe information environment (dissemination, retrieving and understanding of information) was added to the ANGELO framework, highlighting the importance of digital literacy. Availability and accessibility of well-maintained walking surfaces, toilets, street lighting and seating options (physical environment), social support, dog-ownership, stigmatization, social isolation, and a sense of belonging (sociocultural environment) and indirect costs (economic environment) were identified as important environmental factors in RW among PSEDS. The identified political and economic factors are intertwined with the other environments. ConclusionsPerceived environmental factors affect RW among PSEDS and peri-urban settings offer specific challenges. Local governments should incorporate citizen perception into decision-making processes to create supportive environments that have the potential to promote RW among PSEDS in a peri-urban setting.

An interdisciplinary approach to environmental conservation policy: a case of Satoyama redevelopment in the peri-urban area

This study proposes a practice and discussion for an interdisciplinary approach to policies for the conservation of suburban and peri-urban ecosystems. We highlight the need for evidence-based assessment of the current quality of the targeted nature from perspectives of natural science and problem formulation, and that causes should be investigated from the combined perspectives of social science, economic evaluation, and policy design and evaluation, with an awareness of the possibility of consensus building. In this study, based on the ongoing international trend of ecosystem conservation, an economic analysis was conducted to examine the direction of Satoyama development as a case study of urban and peri-urban ecosystem conservation. The result identified the preference and needs of citizens with regard to Satoyama ecosystems and discussed the consistency between policy targets and citizens’ evaluation.

Gender-based planning of meals at the household level in Ghana

Planning is important for the management and sustainable use of resources. To ensure sustainable quality meals, there is the need to plan meals in the home. Planning of meals can best be achieved if gender, especially, women who are the key people responsible for meals in the home, are involved. Therefore, this study was conducted to investigate the determinants of gender-based meal planning and the frequency of meals in Ghana using structured questionnaires and a multistage sampling technique. A total of 3521 households were interviewed across fourteen regions of Ghana, to identify how males and females plan their meals at the household level, and the key players involved in the choice of meals in the home. The country is stratified into regions and the regions further stratified into urban, peri-urban and rural areas. Purposive sampling was used to select households for the survey considering social classes and livelihoods of the people in the communities. Data obtained were entered in Statistical Product and Service Solutions (SPSS) version 16 (IBM SPSS, Armonk, NY) for analysis using the Pearson’s chi square at a P-value of 0.05 to determine statistical differences between gender. Associations between factors that influence frequencies of meals were determined by Cramér's V. Findings showed that, women are mostly responsible for meals at the household level. The study also showed that most Ghanaian households eat three times per day, but their meals are often not planned. Furthermore, the findings of the study suggest that educational attainment and income do not have significant impact on the frequency of meals and gender-based planning of meals in the home. The study showed that 67.41% of households involved in the study were headed by men but those responsible for cooking were mostly women (63.71%). Only a few households planned their meals. Of these, women were mostly responsible for the provision of meals. Therefore, it is important to consider gender in the planning of meals to ensure good nutrition and food availability to the household throughout the year. Key words: food quality, food security, gender, household meal, nutrition, planning, women

Phylogeny and spatial distribution of Japanese encephalitis virus vector species in Cambodia.

In Southeast Asia, despite the use of Japanese encephalitis vaccines and vaccination coverage, Japanese encephalitis (JE) transmission is still a major public health issue. The main vectors of this virus are mosquitoes from the genus Culex, which diversity and density are important in Southeast Asia. The main vector species of Japanese encephalitis virus (JEV) in Cambodia belong to the Vishnui subgroup. However, their morphological identification solely based on the adult stage remains challenging, making their segregation and detection difficult. In order to identify and describe the distribution of the three main JEV vector species in Cambodia, namely Culex vishnui, Cx. pseudovishnui and Cx. tritaeniorhynchus, mosquito samplings were carried out throughout the country in different environments. Phylogenetic analysis of the cytochrome c oxidase subunit I (coI) gene using maximum-likelihood tree with ultrafast bootstrap and phylogeographic analysis were performed. The three main Culex species are phylogenetically separated, and represent two distinct clades, one with Cx. tritaeniorhynchus and the second with Cx. vishnui and Cx. pseudovishnui, the latter appearing as a subgroup of Cx. vishnui. The phylogeographic analysis shows a distribution of the Vishnui subgroup on the entire Cambodian territory with an overlapped distribution areas leading to a sympatric distribution of these species. The three JEV vector species are geographically well-defined with a strong presence of Cx. pseudovishnui in the forest. Combined with the presence of Cx. tritaeniorhynchus and Cx. vishnui in rural, peri-urban, and urban areas, the presence of JEV-competent vectors is widespread in Cambodia.

Groundwater vulnerability assessment to pollution using GIS-based DRASTIC and GOD methods in Araihazar upazila of Narayanganj district, Bangladesh

A groundwater vulnerability map is a preliminary way to assess the risk of groundwater pollution from a variety of sources and across a range of geological and hydrological contexts. With rapid urbanization and industrialization, the possibility of groundwater contamination has greatly increased in Bangladesh. The focus of this study is on an industrialized peri-urban area in Bangladesh, where the regional aquifer has already been depressurized owing to pumping to fulfill the ascending municipal and industrial water demand of the Dhaka megacity and adjacent areas. Two vulnerability index maps were created utilizing a Geographic Information System (GIS) and the contamination risk indices DRASTIC (Depth to water table (D), Net recharge (R), Aquifer media (A), Soil media (S), Topography (T), Impact of vadose zone (I) and hydraulic Conductivity of the aquifer (C)) and GOD (Groundwater or hydraulic confinement in the aquifer under consideration (G), Overlying strata in terms of lithological characters that determine the pollutant attenuation capacity (O) and Depth to groundwater (D)). Vulnerabilities varied greatly over the study area. The DRASTIC analysis identified three vulnerability classes: one-fifth of the area exhibited high vulnerability, more than half of the study area showed moderate vulnerability and rest of the area is low in vulnerability. In contrast, GOD analysis was somewhat conservative, showed two classes where vulnerability was negligible in 58% of the study area and low in the rest of the area. The study also generated hot-spot maps of potential surface contamination for each vulnerability map by overlapping the potentially hazardous activity layer which corresponds to areas with higher industrial clusters. Human activities that commonly cause groundwater pollution need to be constrained by utilizing groundwater protection strategies in the identified vulnerable areas to ensure sustainable development.

The Impacts of Peri-Urban Expansion on Municipal and Ecosystem Services: Experiences from Makhado Biaba Town, South Africa

The sub-Saharan cities are growing and changing due to immigration and modernization. One of the consequences of the current urbanization is that an increasing number of families residing in peri-urban areas of small rural towns lack access to basic municipal and ecosystem services. The purpose of the paper is to demonstrate the impacts of peri-urban expansion on municipal services provided by the governments and on ecosystems services through a case study of a small rural town called Makhado Biaba in Limpopo Province of South Africa. Makhado Biaba has been experiencing incessant rapid physical expansion over the years. Such spatial expansion into the peri-urban zone impacts the provision of municipal services such as water, electricity, sewerage, and refuse collection. In 2020, an exploratory mixed-methods study of some anthropocentric and ecosystem changes in Makhado Biaba Local Municipality in northeast South Africa was executed. Land use was mapped for the time period of 1990–2020, data were gathered through a household questionnaire in six villages, and interviews were held with municipal officials. Among others, the study showed that several municipal services are available in the peri-urban villages of Makhado Biaba Town despite the distant locations outside the urban core. However, services are not uniformly distributed due to that new peri-urban developments that are leapfrogging into vacant land without supporting infrastructure. The pace of the municipality in providing the necessary municipal services such as water and energy supply, as well as sanitation and refuse removal, is lagging behind the development of new and unplanned housing areas. The findings bring about information about the suburban livelihoods and how the administration of the peri-urban areas can respond to the needs of the inhabitants as well as to future challenges. For instance, to facilitate local development, recurrent and well-structured citizen dialogs with local groups to identify delivery failures are strongly recommended. In addition, the impact on ecosystem services by the city development and land use change stresses the need for guided urban development and expansion and also settlement upgrading programs in peri-urban zones to limit the bad effect on ecosystem services.

Types of pharmaceuticals in homesteads in Eswatini: knowledge level of dangers of storage and disposal, and description of practices among home-dwellers in urban and rural settings

The dramatic increase in chemical production and trade during the past three decades has raised both public and official concern about the potential risks posed by hazardous chemicals pesticides and medicines. With increased threat from HIV infection, many householders find themselves needing to access and keep a complex and diverse variety of pharmaceuticals. A cross-sectional, explorative and qualitative survey was carried out among 329 households involving in-depth interviews and observation to investigate types of pharmaceuticals found in rural, peri-urban and urban areas in Eswatini, the level of knowledge of householders and disposal practices of unused and expired pharmaceuticals. Eswatini does not have any laws that regulate the management of household pharmaceuticals. The results of the survey suggested that a majority of homesteads (85%) stored unused, often expired and left-over pharmaceuticals mainly for future use. The level of knowledge of risks associated with presence of pharmaceuticals was found to be very low among householders and that no programmes were initiated by the local health authority or the municipal councils to enhance the knowledge levels. Eighty-two different types of pharmaceuticals were identified including analgesics (38%), antibiotics (27%), supplements (21%) and others (14%). In urban areas, respondents reported that they disposed waste pharmaceuticals into the normal bins which are collected and disposed into landfills and dump sites while peri-urban and rural areas reported that they burn their pharmaceuticals in backyards. The findings in this study suggest the need for further research to determine availability of the variety of pharmaceuticals in surface, ground and drinking water around the country. Guidelines for management and safe disposal of pharmaceuticals need to be urgently developed and programmes to educate householders should be initiated in Eswatini.